Quarterly report pursuant to Section 13 or 15(d)

Licenses Acquired - Research and development expenses (Details)

v3.19.2
Licenses Acquired - Research and development expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total licenses acquired expense $ 200 $ 1 $ 650 $ 98
Mustang Therapeutics, Inc [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total licenses acquired expense 200   650 75
Mustang Therapeutics, Inc [Member] | City of Hope COH CD123 (MB-102) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total licenses acquired expense     250  
Mustang Therapeutics, Inc [Member] | CS-1 City of Hope Milestone (MB-104) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total licenses acquired expense $ 200   200  
Mustang Therapeutics, Inc [Member] | Nationwide Children's Hospital - C134 (MB-108) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total licenses acquired expense     $ 200  
Mustang Therapeutics, Inc [Member] | Manufacturing License [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total licenses acquired expense       $ 75